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3 years ago

Solve -3x - y = 8 - 7x + 3y = -24

Mathematics

2 answers:

Nookie1986 [14]3 years ago

7 0

The solution is (0,-8)

My name is Ann [436]3 years ago

3 0

Answer:

1.x1=49.5 or x2=-48.5

Step-by-step explanation:

=-3x-y-8=8-8

=-3x-y-8=0 --> a=-3 b=-1 c=-8

solve it using quadratic formula

=-(-1)±√(-1)^2-4(-3)(-8)/2

= 1±√2+96/2

=1±√98/2

=1+98/2 ----> x1=49.5

=1-98/2 -----> x2=-48.5

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3 years ago

Read 2 more answers

the price of a gallon of unleaded gas was $2.86 yesterday. today, the price fell to $2.79. find the percent decrease. round answ

soldier1979 [14.2K]

So.. 2.86 - 2.79 is the amount in decrease or 0.07

so.. if we take 2.86 as the 100%, how much is 0.07 of that in percentage?

well $\bf \begin{array}{ccllll}
amount&\%\\
\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\
2.86&100\\
0.07&x
\end{array}\implies \cfrac{2.86}{0.07}=\cfrac{100}{x}$

solve for "x"

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3 years ago